I CANNOT understand boyfriends behavior please help?

[Morgand1998]

So my boyfriend got cheated on twice, in freshman & sophomore year by two different girls. Junior year he cheated on his girlfriend, he was my best friend at the time, the other woman was 28 and absolutely manipulating him (16) and was a pedo who honestly should have been in jail. After being friends for years and helping him through this stuff, we started dating the summer we graduated. He went off to college two hours away, I visit every 2 weeks, we talk constantly, he begs and insists I stay with his family when he's home for breaks- also on that note y relationship with his family is wonderful, parents love me and I love them, his mom and I go shopping together and his dad helps me with car stuff and whatnot, and we spend a lot of time with them when my boyfriend is home. My parents like him but are not in my life so we barely see them, but he gets along with my little siblings amazing (a 3 year old boy & 3 year old girl and 15 year old girl) and we all hang out and things. He's a wonderful, caring, loving boyfriend. He has assured me he would never be able to cheat on me or hurt me and he cries when I talk about maybe ending it over the distance being too hard for me. Yet, I've caught him cheating on me. Not physically, but sexting. The 28 year old, now 30, and another girl we knew in highschool- a HORRIBLE girl who was known for being awful! We are also in a ddlg relationship, And run a tumblr together, lately he talks to a lot of other girls in the community& deleted the convos after- one girl was underage and 15!! He won't admit to these things but I know he does them for a fact, and every time I try and ask him if he's still being honest and if he wants to tell me anything he flips **** about how I should be ashamed, he'd never live with himself if he cheated etc and I've even gone so far as to blatantly say "I know you sexted _(30 yr old) so just admit it so we can work on it! I want to help you not leave you!" And he STILL refuses to acknowledge it????

[RockRose]

You DO understand his behavior,  perfectly,  you just don't want to admit it because it's too painful.  

He likes having you around,  you've been there a long time and are very supportive,  and his family likes you.  So he doesn't want to lose you.

But he doesn't respect or love you and he thinks you're dumb enough to be convinced that what you see with your very own eyes isn't true - but in fact,  you're only pretending to believe him,  you aren't dumb.  You just want so badly to believe this whole ridiculous charade you'll ignore what you're seeing.

I agree with the others.  Enough of this.  

Best wishes.

[Kaye18]

I feel you girl, but the only difference is my boyfriend admits what he did wrong.
Lemme tell you, walk away. Walk away if you still can please don't be like me. I hate myself for being so stupid and still be with him until now. And I'm stuck, please walk away. You deserve better.

[Nighthawk61]

I'd have to walk away from a liar. You've said that you've openly tried to discuss it with him in a non threatening manner (I want to help you not leave you) and he still lies. This seems to be ingrained in him and what one does not acknowledge, one will repeat. I'm so sorry but in order to be happy and secure in your life, I don't think you have any choice but to walk on and find a person that has the same values as you do.

[Nighthawk61]

ps a mate good enough for you to support is out there, but they can't find you if you're otherwise engaged. ... the sooner the better. This doesn't mean that you stop loving or caring. But to give yourself a chance at something different, you need to distance yourself totally.